{"id":10699,"date":"2025-11-30T11:07:54","date_gmt":"2025-11-30T07:37:54","guid":{"rendered":"https:\/\/bidak-co.com\/%d8%aa%d8%b1%da%a9\/"},"modified":"2026-06-17T19:31:16","modified_gmt":"2026-06-17T16:01:16","slug":"crack","status":"publish","type":"post","link":"https:\/\/bidak-co.com\/en\/crack\/","title":{"rendered":"Wall cracks: a simple sign or a structural warning? Accordingly, a complete guide to analyzing and fixing them"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"10699\" class=\"elementor elementor-10699 elementor-9110\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-d9a412c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d9a412c\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-da576bf\" data-id=\"da576bf\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-cd5d0a2 elementor-widget elementor-widget-heading\" data-id=\"cd5d0a2\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Structural cracks \u2014 a simple sign or a serious warning?<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e94c9de elementor-widget elementor-widget-text-editor\" data-id=\"e94c9de\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Observing cracks on walls, ceilings, or around <span style=\"text-decoration: underline;\"><span style=\"color: #0000ff; text-decoration: underline;\"><a style=\"color: #0000ff; text-decoration: underline;\" href=\"https:\/\/en.wikipedia.org\/wiki\/Building\">building<\/a> <\/span><\/span>openings is a common issue, and almost everyone has experienced dealing with them. However, the important point is that not all cracks are the same; some only affect the appearance, while others can be a sign of structural weakness or the beginning of a hidden danger.<\/span><\/strong><\/p><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">In this article, we will try to examine structural cracks comprehensively and step by step, so that the reader gains an accurate and practical understanding of the issue. Therefore, the discussion will follow this structure:<\/span><\/strong><\/p><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">First,<\/span><\/strong><span class=\"\">\u00a0we will address why cracks matter and how both ignorance and excessive worry about them can be mistakes.<\/span><\/p><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Then,<\/span><\/strong><span class=\"\">\u00a0the difference between surface and deep cracks will be explained, so that it becomes clear which cracks are merely cosmetic and which ones require technical evaluation.<\/span><\/p><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Next,<\/span><\/strong><span class=\"\">\u00a0the main causes of cracks \u2014 including ground settlement, poor material quality, and structural stresses \u2014 will be analyzed.<\/span><\/p><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">After that,<\/span><\/strong><span class=\"\">\u00a0different types of cracks based on shape and direction (vertical, horizontal, diagonal, and hairline) will be introduced and interpreted individually.<\/span><\/p><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Finally,<\/span><\/strong><span class=\"\">\u00a0specific topics such as cracks caused by foundation settlement, cracks originating from the ceiling, and the effect of temperature changes will be examined in dedicated sections.<\/span><\/p><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">The goal of this article<\/span><\/strong><span class=\"\">\u00a0is that structural cracks should not be seen merely as lines on the surface, but rather as analyzable messages, so that informed and timely decisions can be made about them.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-feff3af elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"feff3af\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-631c53f\" data-id=\"631c53f\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-165b2f1 elementor-widget elementor-widget-heading\" data-id=\"165b2f1\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why cracks matter \u2014 and why a logical response is necessary<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-eefa793 elementor-widget elementor-widget-text-editor\" data-id=\"eefa793\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Cracks visually convey structural, environmental, or workmanship messages. Accordingly, the appropriate response to these messages determines the safety, economy, and peace of mind of the building&#8217;s occupants. Therefore, there are two common mistakes when dealing with cracks: ignoring real dangers and overreacting to harmless cracks. Both have negative consequences; thus, proper diagnosis and appropriate action are essential.<\/span><\/strong><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Why cracks matter<\/span><\/strong><\/h5><ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Understanding the structural condition:<\/span><\/strong><span class=\"\">\u00a0Deep or specific cracks can indicate structural movement, foundation settlement, rebar corrosion, or unauthorized loading.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Preventing the spread of damage:<\/span><\/strong><span class=\"\">\u00a0Small active cracks may gradually enlarge and require extensive and costly repairs. Therefore, timely action reduces repair costs.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Maintaining safety:<\/span><\/strong><span class=\"\">\u00a0Some cracks \u2014 especially horizontal ones or those accompanied by displacement \u2014 can indicate a reduction in the load-bearing capacity of a wall or structural element. In these cases, delaying investigation can lead to life and property risks.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Preserving building value and appearance:<\/span><\/strong><span class=\"\">\u00a0Even surface cracks, if ignored, will eventually allow moisture infiltration, efflorescence, or damage to finishes, thereby reducing property value.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Legal and insurance matters:<\/span><\/strong><span class=\"\">\u00a0Documenting and reporting significant cracks has legal importance when filing insurance claims or contractor liability issues.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0The danger of neglect \u2014 common consequences<\/span><\/strong><\/h5><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Crack development and expansion to the point where simple repair is no longer possible.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Exacerbation of rebar corrosion (in concrete) and increased structural renovation costs.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Water and moisture infiltration through gaps, leading to efflorescence, <span style=\"text-decoration: underline;\"><span style=\"color: #0000ff; text-decoration: underline;\"><a style=\"color: #0000ff; text-decoration: underline;\" href=\"https:\/\/bidak-co.com\/en\/mold-and-fungus\/\">mold<\/a><\/span><\/span>, or internal damage.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">In severe cases, reduced load tolerance and risk of collapse or the need for emergency evacuation.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0The danger of overreaction \u2014 why not all cracks should be assumed dangerous<\/span><\/strong><\/h5><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Spending time and money on cosmetic repairs instead of identifying the root cause (e.g., simply patching an active crack without investigation).<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Creating unnecessary stress and anxiety for occupants.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Furthermore, in some cases, unprofessional &#8220;strengthening&#8221; or &#8220;demolition&#8221; without an engineer&#8217;s opinion can make the situation worse.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Logical criteria for prioritizing cracks (when should you be worried?)<\/span><\/strong><\/h5><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Cracks that should be examined immediately:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Horizontal cracks or those that show a bulging wall.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Cracks with a width of 3 mm or more, or those that expand over a short period.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Cracks accompanied by visible displacement (e.g., one side of the crack has shifted relative to the other).<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Cracks accompanied by sagging finishes, cracking sounds, or changes in door\/window operation.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Cracks alongside severe dampness, persistent moisture, or visible rebar corrosion.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Cracks that usually are less urgent but should still be monitored:<\/span><\/strong><\/h5><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Hairline or surface cracks (width less than 1 mm).<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Cracks that appear simultaneously with temperature or humidity fluctuations but remain stable over time.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Initial actions a homeowner should take (simple, step-by-step)<\/span><\/strong><\/h5><ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Documentation:<\/span><\/strong><span class=\"\">\u00a0Take photos of the crack with dates, measure approximate length and width, and record the exact location.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Install a simple indicator:<\/span><\/strong><span class=\"\">\u00a0Stick a piece of paper tape or make marks on both sides of the crack to track changes; alternatively, use a crack gauge for more important cases.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Assess accompanying signs:<\/span><\/strong><span class=\"\">\u00a0Check doors and windows (sticking or not opening properly), efflorescence, water seepage or dampness, and any sounds or noticeable settlement.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Monitoring:<\/span><\/strong><span class=\"\">\u00a0Inspect weekly or monthly and record images to determine the trend (stable, regressing, or progressing).<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Contact a specialist:<\/span><\/strong><span class=\"\">\u00a0If any of the high-urgency criteria are present or if the crack is spreading rapidly, it is essential to contact a structural engineer or qualified expert.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0The role of an expert and the technical investigation process<\/span><\/strong><\/h5><ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Visual and tool-assisted inspection:<\/span><\/strong><span class=\"\">\u00a0Determine crack width, depth, and direction; use a crack gauge, borescope, and, if necessary, moisture penetration tests or rebar inspection with appropriate tools.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Determine the cause:<\/span><\/strong><span class=\"\">\u00a0Investigate foundation settlement, loading issues, workmanship problems, corrosion, or environmental factors.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Propose corrective action:<\/span><\/strong><span class=\"\">\u00a0From surface repair to resin injection, stitching, wall reinforcement, or foundation remediation \u2014 along with a post-repair monitoring plan.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Financial takeaway \u2014 predictable cost vs. risk<\/span><\/strong><\/h5><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Timely repair of simple cracks is usually low-cost.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Delaying attention to structural cracks typically leads to significantly higher costs (structural repair, foundation strengthening, wall replacement, or temporary evacuation).<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Overreaction (unnecessary actions) also results in wasted, unjustified expenses; therefore, investing in correct diagnosis is more economical.<\/span><\/p><\/li><\/ul><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Key point<\/span><\/strong><\/h6><p class=\"ds-markdown-paragraph\"><span class=\"\">Cracks are neither merely a &#8220;cosmetic problem&#8221; nor necessarily an &#8220;imminent danger&#8221; \u2014 rather, they are diagnostic messages. Therefore, a rational response to these messages includes accurate documentation, monitoring, cause diagnosis, and appropriate action. Accordingly, combining these four steps \u2014 observation, documentation, analysis, and action \u2014 prevents costly and dangerous mistakes and, in emergencies, will preserve the safety of people and property.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-9ddff29 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"9ddff29\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-fc8dc70\" data-id=\"fc8dc70\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b6f6ba3 elementor-widget elementor-widget-image\" data-id=\"b6f6ba3\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-6.jpg\" class=\"attachment-large size-large wp-image-9118\" alt=\"\u062a\u0631\u06a9\u200c\u0647\u0627\u06cc \u0633\u0627\u062e\u062a\u0645\u0627\u0646\u06cc\" srcset=\"https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-6.jpg 1024w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-6-300x300.jpg 300w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-6-150x150.jpg 150w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-6-768x768.jpg 768w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-6-600x600.jpg 600w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-6-100x100.jpg 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-85ddab0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"85ddab0\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-9dc001e\" data-id=\"9dc001e\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-33ab585 elementor-widget elementor-widget-heading\" data-id=\"33ab585\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Repairing surface cracks \u2014 a step-by-step method<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e370a49 elementor-widget elementor-widget-text-editor\" data-id=\"e370a49\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Suitable for:<\/span><\/strong><span class=\"\">\u00a0Narrow surface cracks on plaster, rendering, or paint (width less than approximately 1\u20131.5 mm, shallow depth).<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Inspection and documentation<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><span class=\"\">Clean and dry the crack, then take a photo with the date, and record the approximate length and width. Furthermore, if the crack is actively spreading, document the progression before repair (using an indicator, dated tape, or a crack gauge).<\/span><\/p><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">2) Cleaning the crack area<\/span><\/strong><\/p><p class=\"ds-markdown-paragraph\"><span class=\"\">First, remove any loose flakes, <span style=\"text-decoration: underline;\"><span style=\"color: #0000ff; text-decoration: underline;\"><a style=\"color: #0000ff; text-decoration: underline;\" href=\"https:\/\/bidak-co.com\/en\/paint-and-patina\/\">paint<\/a><\/span><\/span>, or loose mortar using a scraper, wire brush, or compressed air until you reach a sound substrate. Then, remove dust with a brush or clean cloth.<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Widening \/ keying (if necessary)<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><span class=\"\">For very thin cracks, open them into a V-shape or a shallow groove (approximately 5\u201310 mm deep with an appropriate width) so that the repair materials have better adhesion. However, this step is not mandatory for very fine cracks unless the existing coating is weak.<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Priming the substrate<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><span class=\"\">If recommended by the repair mortar manufacturer, apply a suitable primer to the crack to control substrate absorption and increase the adhesion of the putty or mortar.<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Filling the crack with putty or repair mortar<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><span class=\"\">Use a putty or repair mortar that matches the surface material (e.g., gypsum putty for plaster, cement-based mortar for cement render). Accordingly, press the material into the crack with a scraper or trowel and smooth it out. If necessary, apply in multiple layers \u2014 thinner layers dry and stabilize better.<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Sanding and final finishing<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><span class=\"\">After initial drying, smooth the surface with fine sandpaper. Then, remove any remaining dust and, if needed, proceed with painting or applying the final coating.<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Final check and documentation<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><span class=\"\">Finally, after one month, re-inspect the area and take photos again to document any possible crack progression.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-193f743 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"193f743\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b731796\" data-id=\"b731796\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-78f4b7a elementor-widget elementor-widget-heading\" data-id=\"78f4b7a\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Repairing deep or structural cracks \u2014 a step-by-step method<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e90e144 elementor-widget elementor-widget-text-editor\" data-id=\"e90e144\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Suitable for:<\/span><\/strong><span class=\"\">\u00a0Cracks with a width of 3 mm or more, cracks that reach the brick or concrete, cracks that originate from openings, or cracks that indicate settlement or loading issues.<\/span><\/p><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Important warning:<\/span><\/strong><span class=\"\">\u00a0Before beginning work on deep cracks, the structural condition must be assessed by a structural engineer. Accordingly, any evidence of ongoing movement, increasing crack width, or multiple cracks in several areas requires technical analysis.<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Technical assessment and decision-making<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><span class=\"\">First, a structural engineer or technical supervisor should examine the condition and determine the cause (settlement, loading, rebar corrosion, thermal cracking, etc.). Then, based on the cause, appropriate repair methods are selected: injection, stitching, localized replacement or strengthening, foundation reinforcement, etc.<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Continuous documentation and measurement<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><span class=\"\">Record the width, length, and direction of the crack, and mark it accordingly. Furthermore, using a crack gauge or reference marks for monitoring is recommended. Additionally, if the crack appears active, begin daily or weekly monitoring.<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Preparation for repair<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><span class=\"\">First, remove any loose debris. Then, clean away dirt, oil, and dust. If moisture or dampness is present, identify and stop the source. For injection repairs, the surface should be kept dry or as low in moisture as possible (unless using specialty waterproofing resins).<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Common structural repair methods<\/span><\/strong><\/h5><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Epoxy resin injection (for dry, load-bearing structural cracks):<\/span><\/strong><\/h6><p class=\"ds-markdown-paragraph\"><span class=\"\">The crack is fitted with ports, and low-viscosity epoxy resin is injected to fill the crack and restore structural continuity. Epoxy is generally suitable for structural cracks and for increasing shear capacity. After initial curing time, the resin hardens and restores load-bearing capacity.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Polyurethane injection (for leaking or damp cracks):<\/span><\/strong><\/h6><p class=\"ds-markdown-paragraph\"><span class=\"\">If water infiltration is present, polyurethane foam or waterproofing resin is more appropriate. These materials foam upon contact with water and block the leakage path.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Stitching or nailing (for longitudinal cracks):<\/span><\/strong><\/h6><p class=\"ds-markdown-paragraph\"><span class=\"\">Holes are drilled horizontally or diagonally on both sides of the crack. Then, metal staples or special reinforcing bars are installed and bonded with epoxy resin to mechanically control the crack. The standard spacing between stitches is typically 150\u2013300 mm (depending on wall thickness and the engineer&#8217;s design).<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Localized block\/brick\/concrete replacement or rebuilding:<\/span><\/strong><\/h6><p class=\"ds-markdown-paragraph\"><span class=\"\">In cases where a large section is damaged or rebar has corroded, removal and reinstatement of the block or concrete area is necessary. Furthermore, anti-corrosion treatment and strengthening should be carried out before new concrete or mortar is placed.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Temporary shoring and bracing (for serious cases):<\/span><\/strong><\/h6><p class=\"ds-markdown-paragraph\"><span class=\"\">If the crack is accompanied by significant displacement or if there is a risk of collapse, temporary shoring, installation of metal bracing, or framing is required before permanent repairs.<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Final coating and protection<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><span class=\"\">After ensuring that the structural repair is sound, fill the repaired area with appropriate mortar and apply final finishing. If necessary, apply anti-corrosion coatings to rebar and local waterproofing.<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Post-repair monitoring<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><span class=\"\">After structural repair, conduct weekly and then monthly inspections for several months. Any recurrence of cracking or the appearance of new cracks indicates insufficient repair or an ongoing active issue, which requires engineering review.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Key tools, materials, and technical tips (summary)<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Materials:<\/span><\/strong><span class=\"\">\u00a0Standard putty, cement-based repair mortar, low-viscosity epoxy resin (for structural cracks), injectable polyurethane (for waterproofing), primers, stainless steel reinforcing bars or stitching rods.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Tools:<\/span><\/strong><span class=\"\">\u00a0Putty knife, trowel, resin injection equipment or hand pump, drill and bits, sandpaper, crack gauge, thermometer, and hygrometer if needed.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Drying note:<\/span><\/strong><span class=\"\">\u00a0Many materials require a dry substrate; therefore, in the presence of moisture, use suitable materials (polyurethane) or perform drying measures.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Curing time:<\/span><\/strong><span class=\"\">\u00a0For load-bearing applications, epoxy typically requires 24\u201348 hours to initial hardness and several days to achieve greater strength \u2014 always follow the manufacturer&#8217;s instructions.<\/span><\/p><\/li><\/ul><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Warning signs and when to call an expert<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Crack width increasing more than 1\u20132 mm per month or a significant increase in width compared to initial records.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Appearance of new cracks in a short period of time or at multiple points in the building.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Horizontal cracks or cracks that cause the wall to visibly bulge.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Falling debris, significant sagging of render or plaster, or a change in door\/window operation (not locking or sticking).<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Visible rebar corrosion or persistent dampness at the crack location.<\/span><\/p><\/li><\/ul><p class=\"ds-markdown-paragraph\"><span class=\"\">In any of the above cases, immediate contact with a structural engineer is strongly recommended.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ea77742 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ea77742\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7a1135e\" data-id=\"7a1135e\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-81ceb75 elementor-widget elementor-widget-image\" data-id=\"81ceb75\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-5.jpg\" class=\"attachment-large size-large wp-image-9135\" alt=\"\u062a\u0631\u06a9\u200c\u0647\u0627\u06cc \u0633\u0627\u062e\u062a\u0645\u0627\u0646\u06cc\" srcset=\"https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-5.jpg 1024w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-5-300x300.jpg 300w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-5-150x150.jpg 150w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-5-768x768.jpg 768w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-5-600x600.jpg 600w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-5-100x100.jpg 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ca15ff2 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ca15ff2\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-61e7253\" data-id=\"61e7253\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6aed6b8 elementor-widget elementor-widget-heading\" data-id=\"6aed6b8\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Main causes of cracks and repair methods \u2014 accordingly, here's what you need to know<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1f07662 elementor-widget elementor-widget-text-editor\" data-id=\"1f07662\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\"><span class=\"\">Cracks in walls and floors have various causes, but ultimately they all boil down to two general factors: physical stresses (settlement, pressure, temperature changes) and weaknesses in materials or workmanship. Therefore, identifying the cause is the primary condition for proper repair.<\/span><\/p><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Settlement of the ground or building foundation<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Cause:<\/span><\/strong><span class=\"\">\u00a0Unbalanced settlement of the soil or foundation causes structural movement and creates cracks in walls and floors, typically in the form of diagonal lines starting from corners or at wall-ceiling junctions.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repair method:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">First, assess the foundation and soil condition with a structural engineer&#8217;s opinion.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">If settlement is still active, perform foundation strengthening (grout injection, localized micro-piling, or sub-foundation reinforcement).<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">After stabilization, open the crack and fill it with cement-based repair mortar or specialized epoxy.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Furthermore, for deep cracks, use fiberglass mesh before the final coating to prevent reopening.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Thermal expansion or contraction<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Cause:<\/span><\/strong><span class=\"\">\u00a0Temperature changes cause materials to expand and contract. Accordingly, if expansion joints are not provided in the substrate or between tiles, cracking is inevitable.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repair method:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Create expansion joints at standard intervals (approximately every 3 to 5 meters on floors and large walls).<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Use flexible materials such as polymer tile <span style=\"text-decoration: underline;\"><span style=\"color: #0000ff; text-decoration: underline;\"><a style=\"color: #0000ff; text-decoration: underline;\" href=\"https:\/\/bidak-co.com\/en\/product\/porcelain-powder-tile-adhesive\/\">adhesive<\/a> <\/span><\/span>or mortar with elastic additives.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">For existing cracks, open the area, fill with elastic adhesive, and then re-seal with flexible silicone or polyurethane.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Weakness in backing plaster or mortar<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Cause:<\/span><\/strong><span class=\"\">\u00a0Weak, washed-out, or improperly proportioned cement-sand mortars shrink as they dry, leading to surface cracks.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repair method:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Remove the loose or delaminated sections.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Re-apply the coating with standard mortar (1:3 cement-to-sand ratio by volume).<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Additionally, to prevent future cracking, use a primer or concrete bonding agent before applying the new coating to increase layer adhesion.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Moisture and dampness<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Cause:<\/span><\/strong><span class=\"\">\u00a0Moisture infiltration from the floor or wall causes materials to swell and expand, resulting in surface cracking.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repair method:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Identify the moisture source (pipe leak, crack in the waterproofing, vapor condensation).<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Thoroughly dry the surface using a dehumidifier or controlled heating.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Then, reapply waterproofing with polymer or bituminous materials.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Finally, repair the crack with waterproof mortar and apply a moisture-resistant paint or coating.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u00a0Structural stresses or improper loading<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Cause:<\/span><\/strong><span class=\"\">\u00a0Excessive load on the roof or wall, or a change in structural load distribution, creates stress at weak points and leads to deep cracks.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repair method:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Have a structural engineer assess the load-bearing condition.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Strengthen the damaged area by rebar implantation, installing a concrete belt, or performing localized concrete repair with epoxy resin.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">For non-load-bearing walls, remove the excess load or transfer forces using steel angles and profiles.<\/span><\/p><\/li><\/ul><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Summary:<\/span><\/strong><\/h6><p class=\"ds-markdown-paragraph\"><span class=\"\">Correctly diagnosing the source of a crack is more important than simply filling it. Therefore, as long as the root cause (settlement, moisture, or thermal movement) is not addressed, any repair will only be temporary.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-cbb175f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"cbb175f\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-dda8e7c\" data-id=\"dda8e7c\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-85e24f2 elementor-widget elementor-widget-heading\" data-id=\"85e24f2\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Types of cracks by shape and orientation \u2014 accordingly, how to identify them<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-69c5886 elementor-widget elementor-widget-text-editor\" data-id=\"69c5886\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\ud83d\udd39 Vertical cracks<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Common cause:<\/span><\/strong><span class=\"\">\u00a0Minor foundation settlement, temperature changes, or material expansion along the height of the wall.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repair method:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Opening the crack:<\/span><\/strong><span class=\"\">\u00a0Using a suitable tool (cutter or thin grinder), open the crack path to a depth of approximately 5 to 10 mm until a sound surface is exposed.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Cleaning:<\/span><\/strong><span class=\"\">\u00a0Remove dust and loose particles with a wire brush or compressed air.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Filling:<\/span><\/strong><span class=\"\">\u00a0Use polymer repair mortar or high-strength tile adhesive to fill the gap. For deeper cracks, inject the mortar in multiple stages.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Final coating:<\/span><\/strong><span class=\"\">\u00a0After drying, smooth the surface with putty or a thin plaster coating.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Prevention:<\/span><\/strong><span class=\"\">\u00a0If the crack recurs, the foundation and wall substrate should be inspected, as settlement may still be ongoing.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\ud83d\udd39 Horizontal cracks<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Common cause:<\/span><\/strong><span class=\"\">\u00a0Lateral soil pressure on basement walls, excessive load from upper floors, or a weak connection between the wall and the structural frame.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repair method:<\/span><\/strong><\/h6><ol start=\"1\"><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Technical assessment is mandatory:<\/span><\/strong><span class=\"\">\u00a0Because this type of crack can indicate structural weakness, a structural engineer must inspect the wall before any repair work begins.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">If deemed safe:<\/span><\/strong><span class=\"\">\u00a0Open and clean the crack path with a grinder. For deep cracks, epoxy resin injection or repair <span style=\"text-decoration: underline;\"><span style=\"color: #0000ff; text-decoration: underline;\"><a style=\"color: #0000ff; text-decoration: underline;\" href=\"https:\/\/bidak-co.com\/en\/product\/bandage-powder\/\">grout<\/a> <\/span><\/span>is the best method, as it provides high adhesion. Furthermore, if moisture is present, use a moisture-resistant primer before injection.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Mechanical reinforcement:<\/span><\/strong><span class=\"\">\u00a0If the crack is wide or has recurred in multiple places, it is better to cover the surface with fiberglass mesh and a thin layer of repair mortar.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Prevention:<\/span><\/strong><span class=\"\">\u00a0Controlling soil pressure around the wall and improving the drainage system is very important to prevent the crack from reappearing.<\/span><\/p><\/li><\/ol><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">\ud83d\udd39 Diagonal cracks<\/span><\/strong><\/p><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Common cause:<\/span><\/strong><span class=\"\">\u00a0Asymmetric foundation settlement or lateral forces (e.g., from an earthquake or severe vibration).<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repair method:<\/span><\/strong><\/h6><ol start=\"1\"><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Investigate the cause of settlement:<\/span><\/strong><span class=\"\">\u00a0If settlement is still ongoing, surface repair is useless. Therefore, the ground or foundation problem must be addressed first.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Surface preparation:<\/span><\/strong><span class=\"\">\u00a0Open and clean the crack with a grinder.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Inject epoxy resin or flexible polymer mortar:<\/span><\/strong><span class=\"\">\u00a0Because the forces are diagonal, use a material that has some flexibility so that it does not crack again in the future.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Use fiber mesh or reinforcing fibers:<\/span><\/strong><span class=\"\">\u00a0On the crack surface, apply fiberglass mesh or carbon fiber (for serious projects) to distribute the stresses.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Final painting or coating:<\/span><\/strong><span class=\"\">\u00a0After complete drying, cover the surface with plaster or paint.<\/span><\/p><\/li><\/ol><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\ud83d\udd39 Hairline cracks<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Common cause:<\/span><\/strong><span class=\"\">\u00a0Shrinkage of plaster or paint after drying, or surface-level humidity changes.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repair method:<\/span><\/strong><\/h6><ol start=\"1\"><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Clean the surface:<\/span><\/strong><span class=\"\">\u00a0Remove dust or flaking paint with fine sandpaper.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Thin putty application:<\/span><\/strong><span class=\"\">\u00a0Use putty specifically for hairline cracks or ready-made repair paste. These putties have elastic properties and prevent the crack from returning.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repainting:<\/span><\/strong><span class=\"\">\u00a0After complete drying, cover the surface with anti-crack paint or acrylic paint.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Prevention:<\/span><\/strong><span class=\"\">\u00a0For new projects, using quality plaster and controlling the drying speed (avoiding direct heating) prevents these cracks from forming.<\/span><\/p><\/li><\/ol><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\u2705 Final note<\/span><\/strong><\/h5><h6 class=\"ds-markdown-paragraph\"><span class=\"\">For all methods:<\/span><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">The surface must be dry, clean, and free of grease or dust.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Carrying out the work at a temperature between 10 and 30 degrees Celsius gives the best results.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Furthermore, if you are unsure about the depth or cause of the crack, be sure to obtain an engineering assessment so that the repair is not merely cosmetic.<\/span><\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f73c44d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f73c44d\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-02b9155\" data-id=\"02b9155\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-13fec21 elementor-widget elementor-widget-image\" data-id=\"13fec21\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-2.jpg\" class=\"attachment-large size-large wp-image-9143\" alt=\"\u062a\u0631\u06a9\u200c\u0647\u0627\u06cc \u0633\u0627\u062e\u062a\u0645\u0627\u0646\u06cc\" srcset=\"https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-2.jpg 1024w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-2-300x300.jpg 300w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-2-150x150.jpg 150w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-2-768x768.jpg 768w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-2-600x600.jpg 600w, https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-2-100x100.jpg 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ef91408 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ef91408\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-09733a7\" data-id=\"09733a7\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ea42101 elementor-widget elementor-widget-heading\" data-id=\"ea42101\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Foundation settlement cracks, ceiling-originating cracks, and temperature-related cracks \u2014 accordingly, how to identify and repair them<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-10e52be elementor-widget elementor-widget-text-editor\" data-id=\"10e52be\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\ud83d\udd39 Cracks caused by foundation settlement<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Cause:<\/span><\/strong><span class=\"\">\u00a0Foundation settlement occurs when the soil beneath the building is not uniformly compacted or, over time, shifts due to moisture, compression, or excavations nearby. This creates tensile forces in the wall and floor, which appear as diagonal or stepped cracks.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Signs:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Cracks that start from the corners of doors or windows and extend diagonally downward.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Deep cracks at the junction of the wall and floor.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Changes in floor level or misalignment of door and window frames (sticking when opening or closing).<\/span><\/p><\/li><\/ul><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repair method:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Initial technical assessment:<\/span><\/strong><span class=\"\">\u00a0Before any action, consult a structural engineer or foundation specialist to determine the extent and type of settlement.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Foundation stabilization:<\/span><\/strong><span class=\"\">\u00a0If settlement is ongoing, first prevent further movement using methods such as grout injection, micro-piles or light piling, or soil improvement beneath the foundation.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Crack repair:<\/span><\/strong><span class=\"\">\u00a0After confirming structural stability, open and clean the crack paths, then fill them with epoxy resin or high-adhesion polymer mortar.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Surface reinforcement:<\/span><\/strong><span class=\"\">\u00a0For load-bearing walls, it is recommended to use fiberglass mesh or carbon fiber tape along the crack to prevent stress transfer.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\ud83d\udd39 Cracks originating from the ceiling<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Cause:<\/span><\/strong><span class=\"\">\u00a0These cracks are typically seen at the junction of the ceiling and wall or along concrete beams. The main reason is the difference in expansion and contraction of different materials (concrete, plaster, or brick) or minor structural movements in the upper floors.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Signs:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Horizontal or diagonal cracks near the ceiling-wall junction.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Separation of the plaster or paint layer along the ceiling edge.<\/span><\/p><\/li><\/ul><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repair method:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Open the crack path:<\/span><\/strong><span class=\"\">\u00a0Using a scraper or hand grinder, open the crack path until reaching a sound surface.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Use joint tape:<\/span><\/strong><span class=\"\">\u00a0To prevent reopening, place fiberglass tape or drywall mesh over the crack.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Putty and final coating:<\/span><\/strong><span class=\"\">\u00a0Cover the tape with repair mortar or ceiling-specific putty and, after drying, smooth the surface and repaint.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Prevention:<\/span><\/strong><span class=\"\">\u00a0Proper installation of the separation joint between wall and ceiling during construction is the most important factor in preventing these cracks from recurring.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\ud83d\udd39 Cracks caused by temperature changes<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Cause:<\/span><\/strong><span class=\"\">\u00a0Repeated expansion and contraction of materials due to heat and cold create stress at the junctions of different materials (such as concrete and plaster or brick and cement), resulting in cracks. This issue is more common on exterior facades and floors exposed to direct sunlight.<\/span><\/p><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Signs:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Regular, approximately parallel cracks with consistent spacing.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">Cracks that are seen mostly on exterior walls or stone and ceramic floors.<\/span><\/p><\/li><\/ul><h6 class=\"ds-markdown-paragraph\"><strong><span class=\"\">Repair method:<\/span><\/strong><\/h6><ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Clean and open the cracks:<\/span><\/strong><span class=\"\">\u00a0Cracks should be opened to a sound depth, and all dust must be completely removed.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Use flexible materials:<\/span><\/strong><span class=\"\">\u00a0For filling this type of crack, it is better to use elastomeric sealants or building silicone that resist temperature changes.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Install expansion joints:<\/span><\/strong><span class=\"\">\u00a0For large floor or facade surfaces, installing expansion joint strips at specified intervals prevents stress concentration and recurring cracks.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Protective coating:<\/span><\/strong><span class=\"\">\u00a0For exterior spaces, using elastic paints or UV-resistant anti-crack coatings is recommended.<\/span><\/p><\/li><\/ul><h5 class=\"ds-markdown-paragraph\"><strong><span class=\"\">\ud83d\udd38 Summary of this section<\/span><\/strong><\/h5><p class=\"ds-markdown-paragraph\"><span class=\"\">No matter how similar cracks may appear, they do not have the same origin. A crack caused by foundation settlement can damage the structure, whereas a crack caused by temperature changes or ceiling movement is usually superficial and can be resolved with simple corrective measures. Therefore, the key point is to identify and control the root cause before any cosmetic repair; otherwise, no matter how precise the repair, it will not last.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3280238 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3280238\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3228cbc\" data-id=\"3228cbc\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8dba071 elementor-widget elementor-widget-heading\" data-id=\"8dba071\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h5 class=\"elementor-heading-title elementor-size-default\">General Conclusion<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6169d1b elementor-widget elementor-widget-text-editor\" data-id=\"6169d1b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"ds-markdown-paragraph\"><span class=\"\">Structural cracks are not merely lines on the wall or ceiling; rather, they are messages about the true condition of the structure and its surrounding environment. Therefore, accurately identifying the type, location, and direction of a crack is the first step in assessing the level of risk and choosing the appropriate repair method.<\/span><\/p><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Key points:<\/span><\/strong><\/p><ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Identifying the crack type:<\/span><\/strong><span class=\"\">\u00a0Surface or hairline cracks are usually cosmetic issues and can be resolved with simple repair. However, vertical, horizontal, or diagonal cracks often indicate structural pressure, foundation settlement, or combined problems that require professional assessment.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Identifying the root causes:<\/span><\/strong><span class=\"\">\u00a0Every crack results from a combination of factors including soil conditions, materials, loading, and environmental changes. Accordingly, before any repair work, the source must be identified and controlled.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Proper repair methods:<\/span><\/strong><\/p><ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">For surface and hairline cracks: putty application, repainting, and surface coating.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">For cracks caused by settlement or structural pressure: foundation stabilization, wall or floor strengthening, and the use of resins and reinforcing mesh.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">For cracks caused by temperature changes: use of flexible materials, expansion joints, and protective coatings.<\/span><\/p><\/li><\/ul><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Preventive measures:<\/span><\/strong><span class=\"\">\u00a0Using quality materials, proper structural execution, and adhering to loading principles and expansion joints ensures the longevity of the structure and the durability of repairs.<\/span><\/p><\/li><\/ul><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Finally,<\/span><\/strong><span class=\"\">\u00a0a comprehensive approach to cracks \u2014 combining accurate diagnosis, control of the root cause, and proper repair \u2014 is the key to managing building safety and aesthetics. With this approach, cracks will not be merely a problem, but rather constructive warnings for protecting investment and security.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Structural cracks \u2014 a simple sign or a serious warning? Observing cracks on walls, ceilings, or around building openings is a common issue, and almost everyone has experienced dealing with them. However, the important point is that not all cracks are the same; some only affect the appearance, while others can be a sign of [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":9113,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[292],"tags":[],"class_list":["post-10699","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category---en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.6 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Crack - Bidak Chemical Industries<\/title>\n<meta name=\"description\" content=\"Crack: complete guide to diagnosing and repairing structural cracks \u2014 causes, types, danger signs, and safe repair methods\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bidak-co.com\/en\/crack\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Crack - Bidak Chemical Industries\" \/>\n<meta property=\"og:description\" content=\"Crack: complete guide to diagnosing and repairing structural cracks \u2014 causes, types, danger signs, and safe repair methods\" \/>\n<meta property=\"og:url\" content=\"https:\/\/bidak-co.com\/en\/crack\/\" \/>\n<meta property=\"og:site_name\" content=\"Bidak Chemical Industries\" \/>\n<meta property=\"article:published_time\" content=\"2025-11-30T07:37:54+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-17T16:01:16+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/bidak-co.com\/wp-content\/uploads\/2025\/11\/Roboo.ir-3.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"1024\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"\u0631\u0627\u062f\u0648\u06cc\u0646 \u0628\u06cc\u0627\u062a\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u0631\u0627\u062f\u0648\u06cc\u0646 \u0628\u06cc\u0627\u062a\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"22 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/bidak-co.com\/en\/crack\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/bidak-co.com\/en\/crack\/\"},\"author\":{\"name\":\"\u0631\u0627\u062f\u0648\u06cc\u0646 \u0628\u06cc\u0627\u062a\",\"@id\":\"https:\/\/bidak-co.com\/#\/schema\/person\/d0aab86887d28d4fbeb0a3949f39e571\"},\"headline\":\"Wall cracks: a simple sign or a structural warning? 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